git.oblomov.eu Git - linux-2.6/blob - drivers/mmc/host/imxmmc.c

   1 /*
   2  *  linux/drivers/mmc/host/imxmmc.c - Motorola i.MX MMCI driver
   3  *
   4  *  Copyright (C) 2004 Sascha Hauer, Pengutronix <sascha@saschahauer.de>
   5  *  Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
   6  *
   7  *  derived from pxamci.c by Russell King
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  *  2005-04-17 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  14  *             Changed to conform redesigned i.MX scatter gather DMA interface
  15  *
  16  *  2005-11-04 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  17  *             Updated for 2.6.14 kernel
  18  *
  19  *  2005-12-13 Jay Monkman <jtm@smoothsmoothie.com>
  20  *             Found and corrected problems in the write path
  21  *
  22  *  2005-12-30 Pavel Pisa <pisa@cmp.felk.cvut.cz>
  23  *             The event handling rewritten right way in softirq.
  24  *             Added many ugly hacks and delays to overcome SDHC
  25  *             deficiencies
  26  *
  27  */
  28
  29 #ifdef CONFIG_MMC_DEBUG
  30 #define DEBUG
  31 #else
  32 #undef  DEBUG
  33 #endif
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/blkdev.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/card.h>
  44 #include <linux/delay.h>
  45
  46 #include <asm/dma.h>
  47 #include <asm/io.h>
  48 #include <asm/irq.h>
  49 #include <asm/sizes.h>
  50 #include <asm/arch/mmc.h>
  51 #include <asm/arch/imx-dma.h>
  52
  53 #include "imxmmc.h"
  54
  55 #define DRIVER_NAME "imx-mmc"
  56
  57 #define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
  58                       INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
  59                       INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
  60
  61 struct imxmci_host {
  62         struct mmc_host         *mmc;
  63         spinlock_t              lock;
  64         struct resource         *res;
  65         int                     irq;
  66         imx_dmach_t             dma;
  67         unsigned int            clkrt;
  68         unsigned int            cmdat;
  69         volatile unsigned int   imask;
  70         unsigned int            power_mode;
  71         unsigned int            present;
  72         struct imxmmc_platform_data *pdata;
  73
  74         struct mmc_request      *req;
  75         struct mmc_command      *cmd;
  76         struct mmc_data         *data;
  77
  78         struct timer_list       timer;
  79         struct tasklet_struct   tasklet;
  80         unsigned int            status_reg;
  81         unsigned long           pending_events;
  82         /* Next to fields are there for CPU driven transfers to overcome SDHC deficiencies */
  83         u16                     *data_ptr;
  84         unsigned int            data_cnt;
  85         atomic_t                stuck_timeout;
  86
  87         unsigned int            dma_nents;
  88         unsigned int            dma_size;
  89         unsigned int            dma_dir;
  90         int                     dma_allocated;
  91
  92         unsigned char           actual_bus_width;
  93
  94         int                     prev_cmd_code;
  95 };
  96
  97 #define IMXMCI_PEND_IRQ_b       0
  98 #define IMXMCI_PEND_DMA_END_b   1
  99 #define IMXMCI_PEND_DMA_ERR_b   2
 100 #define IMXMCI_PEND_WAIT_RESP_b 3
 101 #define IMXMCI_PEND_DMA_DATA_b  4
 102 #define IMXMCI_PEND_CPU_DATA_b  5
 103 #define IMXMCI_PEND_CARD_XCHG_b 6
 104 #define IMXMCI_PEND_SET_INIT_b  7
 105 #define IMXMCI_PEND_STARTED_b   8
 106
 107 #define IMXMCI_PEND_IRQ_m       (1 << IMXMCI_PEND_IRQ_b)
 108 #define IMXMCI_PEND_DMA_END_m   (1 << IMXMCI_PEND_DMA_END_b)
 109 #define IMXMCI_PEND_DMA_ERR_m   (1 << IMXMCI_PEND_DMA_ERR_b)
 110 #define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
 111 #define IMXMCI_PEND_DMA_DATA_m  (1 << IMXMCI_PEND_DMA_DATA_b)
 112 #define IMXMCI_PEND_CPU_DATA_m  (1 << IMXMCI_PEND_CPU_DATA_b)
 113 #define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
 114 #define IMXMCI_PEND_SET_INIT_m  (1 << IMXMCI_PEND_SET_INIT_b)
 115 #define IMXMCI_PEND_STARTED_m   (1 << IMXMCI_PEND_STARTED_b)
 116
 117 static void imxmci_stop_clock(struct imxmci_host *host)
 118 {
 119         int i = 0;
 120         MMC_STR_STP_CLK &= ~STR_STP_CLK_START_CLK;
 121         while(i < 0x1000) {
 122                 if(!(i & 0x7f))
 123                         MMC_STR_STP_CLK |= STR_STP_CLK_STOP_CLK;
 124
 125                 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) {
 126                         /* Check twice before cut */
 127                         if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN))
 128                                 return;
 129                 }
 130
 131                 i++;
 132         }
 133         dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
 134 }
 135
 136 static int imxmci_start_clock(struct imxmci_host *host)
 137 {
 138         unsigned int trials = 0;
 139         unsigned int delay_limit = 128;
 140         unsigned long flags;
 141
 142         MMC_STR_STP_CLK &= ~STR_STP_CLK_STOP_CLK;
 143
 144         clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
 145
 146         /*
 147          * Command start of the clock, this usually succeeds in less
 148          * then 6 delay loops, but during card detection (low clockrate)
 149          * it takes up to 5000 delay loops and sometimes fails for the first time
 150          */
 151         MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
 152
 153         do {
 154                 unsigned int delay = delay_limit;
 155
 156                 while(delay--){
 157                         if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
 158                                 /* Check twice before cut */
 159                                 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
 160                                         return 0;
 161
 162                         if(test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
 163                                 return 0;
 164                 }
 165
 166                 local_irq_save(flags);
 167                 /*
 168                  * Ensure, that request is not doubled under all possible circumstances.
 169                  * It is possible, that cock running state is missed, because some other
 170                  * IRQ or schedule delays this function execution and the clocks has
 171                  * been already stopped by other means (response processing, SDHC HW)
 172                  */
 173                 if(!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
 174                         MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
 175                 local_irq_restore(flags);
 176
 177         } while(++trials<256);
 178
 179         dev_err(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
 180
 181         return -1;
 182 }
 183
 184 static void imxmci_softreset(void)
 185 {
 186         /* reset sequence */
 187         MMC_STR_STP_CLK = 0x8;
 188         MMC_STR_STP_CLK = 0xD;
 189         MMC_STR_STP_CLK = 0x5;
 190         MMC_STR_STP_CLK = 0x5;
 191         MMC_STR_STP_CLK = 0x5;
 192         MMC_STR_STP_CLK = 0x5;
 193         MMC_STR_STP_CLK = 0x5;
 194         MMC_STR_STP_CLK = 0x5;
 195         MMC_STR_STP_CLK = 0x5;
 196         MMC_STR_STP_CLK = 0x5;
 197
 198         MMC_RES_TO = 0xff;
 199         MMC_BLK_LEN = 512;
 200         MMC_NOB = 1;
 201 }
 202
 203 static int imxmci_busy_wait_for_status(struct imxmci_host *host,
 204                         unsigned int *pstat, unsigned int stat_mask,
 205                         int timeout, const char *where)
 206 {
 207         int loops=0;
 208         while(!(*pstat & stat_mask)) {
 209                 loops+=2;
 210                 if(loops >= timeout) {
 211                         dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
 212                                 where, *pstat, stat_mask);
 213                         return -1;
 214                 }
 215                 udelay(2);
 216                 *pstat |= MMC_STATUS;
 217         }
 218         if(!loops)
 219                 return 0;
 220
 221         /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
 222         if(!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock>=8000000))
 223                 dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
 224                         loops, where, *pstat, stat_mask);
 225         return loops;
 226 }
 227
 228 static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
 229 {
 230         unsigned int nob = data->blocks;
 231         unsigned int blksz = data->blksz;
 232         unsigned int datasz = nob * blksz;
 233         int i;
 234
 235         if (data->flags & MMC_DATA_STREAM)
 236                 nob = 0xffff;
 237
 238         host->data = data;
 239         data->bytes_xfered = 0;
 240
 241         MMC_NOB = nob;
 242         MMC_BLK_LEN = blksz;
 243
 244         /*
 245          * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
 246          * We are in big troubles for non-512 byte transfers according to note in the paragraph
 247          * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
 248          * The situation is even more complex in reality. The SDHC in not able to handle wll
 249          * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
 250          * This is required for SCR read at least.
 251          */
 252         if (datasz < 512) {
 253                 host->dma_size = datasz;
 254                 if (data->flags & MMC_DATA_READ) {
 255                         host->dma_dir = DMA_FROM_DEVICE;
 256
 257                         /* Hack to enable read SCR */
 258                         MMC_NOB = 1;
 259                         MMC_BLK_LEN = 512;
 260                 } else {
 261                         host->dma_dir = DMA_TO_DEVICE;
 262                 }
 263
 264                 /* Convert back to virtual address */
 265                 host->data_ptr = (u16*)(page_address(data->sg->page) + data->sg->offset);
 266                 host->data_cnt = 0;
 267
 268                 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
 269                 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
 270
 271                 return;
 272         }
 273
 274         if (data->flags & MMC_DATA_READ) {
 275                 host->dma_dir = DMA_FROM_DEVICE;
 276                 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
 277                                                 data->sg_len,  host->dma_dir);
 278
 279                 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
 280                         host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ);
 281
 282                 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
 283                 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
 284         } else {
 285                 host->dma_dir = DMA_TO_DEVICE;
 286
 287                 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
 288                                                 data->sg_len,  host->dma_dir);
 289
 290                 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
 291                         host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE);
 292
 293                 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
 294                 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
 295         }
 296
 297 #if 1   /* This code is there only for consistency checking and can be disabled in future */
 298         host->dma_size = 0;
 299         for(i=0; i<host->dma_nents; i++)
 300                 host->dma_size+=data->sg[i].length;
 301
 302         if (datasz > host->dma_size) {
 303                 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
 304                        datasz, host->dma_size);
 305         }
 306 #endif
 307
 308         host->dma_size = datasz;
 309
 310         wmb();
 311
 312         if(host->actual_bus_width == MMC_BUS_WIDTH_4)
 313                 BLR(host->dma) = 0;     /* burst 64 byte read / 64 bytes write */
 314         else
 315                 BLR(host->dma) = 16;    /* burst 16 byte read / 16 bytes write */
 316
 317         RSSR(host->dma) = DMA_REQ_SDHC;
 318
 319         set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
 320         clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
 321
 322         /* start DMA engine for read, write is delayed after initial response */
 323         if (host->dma_dir == DMA_FROM_DEVICE) {
 324                 imx_dma_enable(host->dma);
 325         }
 326 }
 327
 328 static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
 329 {
 330         unsigned long flags;
 331         u32 imask;
 332
 333         WARN_ON(host->cmd != NULL);
 334         host->cmd = cmd;
 335
 336         /* Ensure, that clock are stopped else command programming and start fails */
 337         imxmci_stop_clock(host);
 338
 339         if (cmd->flags & MMC_RSP_BUSY)
 340                 cmdat |= CMD_DAT_CONT_BUSY;
 341
 342         switch (mmc_resp_type(cmd)) {
 343         case MMC_RSP_R1: /* short CRC, OPCODE */
 344         case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
 345                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
 346                 break;
 347         case MMC_RSP_R2: /* long 136 bit + CRC */
 348                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
 349                 break;
 350         case MMC_RSP_R3: /* short */
 351                 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
 352                 break;
 353         default:
 354                 break;
 355         }
 356
 357         if ( test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events) )
 358                 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
 359
 360         if ( host->actual_bus_width == MMC_BUS_WIDTH_4 )
 361                 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
 362
 363         MMC_CMD = cmd->opcode;
 364         MMC_ARGH = cmd->arg >> 16;
 365         MMC_ARGL = cmd->arg & 0xffff;
 366         MMC_CMD_DAT_CONT = cmdat;
 367
 368         atomic_set(&host->stuck_timeout, 0);
 369         set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
 370
 371
 372         imask = IMXMCI_INT_MASK_DEFAULT;
 373         imask &= ~INT_MASK_END_CMD_RES;
 374         if ( cmdat & CMD_DAT_CONT_DATA_ENABLE ) {
 375                 /*imask &= ~INT_MASK_BUF_READY;*/
 376                 imask &= ~INT_MASK_DATA_TRAN;
 377                 if ( cmdat & CMD_DAT_CONT_WRITE )
 378                         imask &= ~INT_MASK_WRITE_OP_DONE;
 379                 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
 380                         imask &= ~INT_MASK_BUF_READY;
 381         }
 382
 383         spin_lock_irqsave(&host->lock, flags);
 384         host->imask = imask;
 385         MMC_INT_MASK = host->imask;
 386         spin_unlock_irqrestore(&host->lock, flags);
 387
 388         dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
 389                 cmd->opcode, cmd->opcode, imask);
 390
 391         imxmci_start_clock(host);
 392 }
 393
 394 static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
 395 {
 396         unsigned long flags;
 397
 398         spin_lock_irqsave(&host->lock, flags);
 399
 400         host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
 401                         IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
 402
 403         host->imask = IMXMCI_INT_MASK_DEFAULT;
 404         MMC_INT_MASK = host->imask;
 405
 406         spin_unlock_irqrestore(&host->lock, flags);
 407
 408         if(req && req->cmd)
 409                 host->prev_cmd_code = req->cmd->opcode;
 410
 411         host->req = NULL;
 412         host->cmd = NULL;
 413         host->data = NULL;
 414         mmc_request_done(host->mmc, req);
 415 }
 416
 417 static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
 418 {
 419         struct mmc_data *data = host->data;
 420         int data_error;
 421
 422         if(test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)){
 423                 imx_dma_disable(host->dma);
 424                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
 425                              host->dma_dir);
 426         }
 427
 428         if ( stat & STATUS_ERR_MASK ) {
 429                 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",stat);
 430                 if(stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
 431                         data->error = -EILSEQ;
 432                 else if(stat & STATUS_TIME_OUT_READ)
 433                         data->error = -ETIMEDOUT;
 434                 else
 435                         data->error = -EIO;
 436         } else {
 437                 data->bytes_xfered = host->dma_size;
 438         }
 439
 440         data_error = data->error;
 441
 442         host->data = NULL;
 443
 444         return data_error;
 445 }
 446
 447 static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
 448 {
 449         struct mmc_command *cmd = host->cmd;
 450         int i;
 451         u32 a,b,c;
 452         struct mmc_data *data = host->data;
 453
 454         if (!cmd)
 455                 return 0;
 456
 457         host->cmd = NULL;
 458
 459         if (stat & STATUS_TIME_OUT_RESP) {
 460                 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
 461                 cmd->error = -ETIMEDOUT;
 462         } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
 463                 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
 464                 cmd->error = -EILSEQ;
 465         }
 466
 467         if(cmd->flags & MMC_RSP_PRESENT) {
 468                 if(cmd->flags & MMC_RSP_136) {
 469                         for (i = 0; i < 4; i++) {
 470                                 u32 a = MMC_RES_FIFO & 0xffff;
 471                                 u32 b = MMC_RES_FIFO & 0xffff;
 472                                 cmd->resp[i] = a<<16 | b;
 473                         }
 474                 } else {
 475                         a = MMC_RES_FIFO & 0xffff;
 476                         b = MMC_RES_FIFO & 0xffff;
 477                         c = MMC_RES_FIFO & 0xffff;
 478                         cmd->resp[0] = a<<24 | b<<8 | c>>8;
 479                 }
 480         }
 481
 482         dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
 483                 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
 484
 485         if (data && !cmd->error && !(stat & STATUS_ERR_MASK)) {
 486                 if (host->req->data->flags & MMC_DATA_WRITE) {
 487
 488                         /* Wait for FIFO to be empty before starting DMA write */
 489
 490                         stat = MMC_STATUS;
 491                         if(imxmci_busy_wait_for_status(host, &stat,
 492                                 STATUS_APPL_BUFF_FE,
 493                                 40, "imxmci_cmd_done DMA WR") < 0) {
 494                                 cmd->error = -EIO;
 495                                 imxmci_finish_data(host, stat);
 496                                 if(host->req)
 497                                         imxmci_finish_request(host, host->req);
 498                                 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
 499                                        stat);
 500                                 return 0;
 501                         }
 502
 503                         if(test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
 504                                 imx_dma_enable(host->dma);
 505                         }
 506                 }
 507         } else {
 508                 struct mmc_request *req;
 509                 imxmci_stop_clock(host);
 510                 req = host->req;
 511
 512                 if(data)
 513                         imxmci_finish_data(host, stat);
 514
 515                 if( req ) {
 516                         imxmci_finish_request(host, req);
 517                 } else {
 518                         dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
 519                 }
 520         }
 521
 522         return 1;
 523 }
 524
 525 static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
 526 {
 527         struct mmc_data *data = host->data;
 528         int data_error;
 529
 530         if (!data)
 531                 return 0;
 532
 533         data_error = imxmci_finish_data(host, stat);
 534
 535         if (host->req->stop) {
 536                 imxmci_stop_clock(host);
 537                 imxmci_start_cmd(host, host->req->stop, 0);
 538         } else {
 539                 struct mmc_request *req;
 540                 req = host->req;
 541                 if( req ) {
 542                         imxmci_finish_request(host, req);
 543                 } else {
 544                         dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
 545                 }
 546         }
 547
 548         return 1;
 549 }
 550
 551 static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
 552 {
 553         int i;
 554         int burst_len;
 555         int trans_done = 0;
 556         unsigned int stat = *pstat;
 557
 558         if(host->actual_bus_width != MMC_BUS_WIDTH_4)
 559                 burst_len = 16;
 560         else
 561                 burst_len = 64;
 562
 563         /* This is unfortunately required */
 564         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
 565                 stat);
 566
 567         udelay(20);     /* required for clocks < 8MHz*/
 568
 569         if(host->dma_dir == DMA_FROM_DEVICE) {
 570                 imxmci_busy_wait_for_status(host, &stat,
 571                                 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE |
 572                                 STATUS_TIME_OUT_READ,
 573                                 50, "imxmci_cpu_driven_data read");
 574
 575                 while((stat & (STATUS_APPL_BUFF_FF |  STATUS_DATA_TRANS_DONE)) &&
 576                       !(stat & STATUS_TIME_OUT_READ) &&
 577                       (host->data_cnt < 512)) {
 578
 579                         udelay(20);     /* required for clocks < 8MHz*/
 580
 581                         for(i = burst_len; i>=2 ; i-=2) {
 582                                 u16 data;
 583                                 data = MMC_BUFFER_ACCESS;
 584                                 udelay(10);     /* required for clocks < 8MHz*/
 585                                 if(host->data_cnt+2 <= host->dma_size) {
 586                                         *(host->data_ptr++) = data;
 587                                 } else {
 588                                         if(host->data_cnt < host->dma_size)
 589                                                 *(u8*)(host->data_ptr) = data;
 590                                 }
 591                                 host->data_cnt += 2;
 592                         }
 593
 594                         stat = MMC_STATUS;
 595
 596                         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
 597                                 host->data_cnt, burst_len, stat);
 598                 }
 599
 600                 if((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
 601                         trans_done = 1;
 602
 603                 if(host->dma_size & 0x1ff)
 604                         stat &= ~STATUS_CRC_READ_ERR;
 605
 606                 if(stat & STATUS_TIME_OUT_READ) {
 607                         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read timeout STATUS = 0x%x\n",
 608                                 stat);
 609                         trans_done = -1;
 610                 }
 611
 612         } else {
 613                 imxmci_busy_wait_for_status(host, &stat,
 614                                 STATUS_APPL_BUFF_FE,
 615                                 20, "imxmci_cpu_driven_data write");
 616
 617                 while((stat & STATUS_APPL_BUFF_FE) &&
 618                       (host->data_cnt < host->dma_size)) {
 619                         if(burst_len >= host->dma_size - host->data_cnt) {
 620                                 burst_len = host->dma_size - host->data_cnt;
 621                                 host->data_cnt = host->dma_size;
 622                                 trans_done = 1;
 623                         } else {
 624                                 host->data_cnt += burst_len;
 625                         }
 626
 627                         for(i = burst_len; i>0 ; i-=2)
 628                                 MMC_BUFFER_ACCESS = *(host->data_ptr++);
 629
 630                         stat = MMC_STATUS;
 631
 632                         dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
 633                                 burst_len, stat);
 634                 }
 635         }
 636
 637         *pstat = stat;
 638
 639         return trans_done;
 640 }
 641
 642 static void imxmci_dma_irq(int dma, void *devid)
 643 {
 644         struct imxmci_host *host = devid;
 645         uint32_t stat = MMC_STATUS;
 646
 647         atomic_set(&host->stuck_timeout, 0);
 648         host->status_reg = stat;
 649         set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
 650         tasklet_schedule(&host->tasklet);
 651 }
 652
 653 static irqreturn_t imxmci_irq(int irq, void *devid)
 654 {
 655         struct imxmci_host *host = devid;
 656         uint32_t stat = MMC_STATUS;
 657         int handled = 1;
 658
 659         MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT;
 660
 661         atomic_set(&host->stuck_timeout, 0);
 662         host->status_reg = stat;
 663         set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
 664         set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
 665         tasklet_schedule(&host->tasklet);
 666
 667         return IRQ_RETVAL(handled);;
 668 }
 669
 670 static void imxmci_tasklet_fnc(unsigned long data)
 671 {
 672         struct imxmci_host *host = (struct imxmci_host *)data;
 673         u32 stat;
 674         unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
 675         int timeout = 0;
 676
 677         if(atomic_read(&host->stuck_timeout) > 4) {
 678                 char *what;
 679                 timeout = 1;
 680                 stat = MMC_STATUS;
 681                 host->status_reg = stat;
 682                 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 683                         if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
 684                                 what = "RESP+DMA";
 685                         else
 686                                 what = "RESP";
 687                 else
 688                         if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
 689                                 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
 690                                         what = "DATA";
 691                                 else
 692                                         what = "DMA";
 693                         else
 694                                 what = "???";
 695
 696                 dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
 697                        what, stat, MMC_INT_MASK);
 698                 dev_err(mmc_dev(host->mmc), "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
 699                        MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
 700                 dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
 701                        host->cmd?host->cmd->opcode:0, host->prev_cmd_code, 1<<host->actual_bus_width, host->dma_size);
 702         }
 703
 704         if(!host->present || timeout)
 705                 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
 706                                     STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
 707
 708         if(test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
 709                 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
 710
 711                 stat = MMC_STATUS;
 712                 /*
 713                  * This is not required in theory, but there is chance to miss some flag
 714                  * which clears automatically by mask write, FreeScale original code keeps
 715                  * stat from IRQ time so do I
 716                  */
 717                 stat |= host->status_reg;
 718
 719                 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
 720                         stat &= ~STATUS_CRC_READ_ERR;
 721
 722                 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
 723                         imxmci_busy_wait_for_status(host, &stat,
 724                                         STATUS_END_CMD_RESP | STATUS_ERR_MASK,
 725                                         20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
 726                 }
 727
 728                 if(stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
 729                         if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 730                                 imxmci_cmd_done(host, stat);
 731                         if(host->data && (stat & STATUS_ERR_MASK))
 732                                 imxmci_data_done(host, stat);
 733                 }
 734
 735                 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
 736                         stat |= MMC_STATUS;
 737                         if(imxmci_cpu_driven_data(host, &stat)){
 738                                 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
 739                                         imxmci_cmd_done(host, stat);
 740                                 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
 741                                                         &host->pending_events);
 742                                 imxmci_data_done(host, stat);
 743                         }
 744                 }
 745         }
 746
 747         if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
 748            !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
 749
 750                 stat = MMC_STATUS;
 751                 /* Same as above */
 752                 stat |= host->status_reg;
 753
 754                 if(host->dma_dir == DMA_TO_DEVICE) {
 755                         data_dir_mask = STATUS_WRITE_OP_DONE;
 756                 } else {
 757                         data_dir_mask = STATUS_DATA_TRANS_DONE;
 758                 }
 759
 760                 if(stat & data_dir_mask) {
 761                         clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
 762                         imxmci_data_done(host, stat);
 763                 }
 764         }
 765
 766         if(test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
 767
 768                 if(host->cmd)
 769                         imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
 770
 771                 if(host->data)
 772                         imxmci_data_done(host, STATUS_TIME_OUT_READ |
 773                                          STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
 774
 775                 if(host->req)
 776                         imxmci_finish_request(host, host->req);
 777
 778                 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
 779
 780         }
 781 }
 782
 783 static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
 784 {
 785         struct imxmci_host *host = mmc_priv(mmc);
 786         unsigned int cmdat;
 787
 788         WARN_ON(host->req != NULL);
 789
 790         host->req = req;
 791
 792         cmdat = 0;
 793
 794         if (req->data) {
 795                 imxmci_setup_data(host, req->data);
 796
 797                 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
 798
 799                 if (req->data->flags & MMC_DATA_WRITE)
 800                         cmdat |= CMD_DAT_CONT_WRITE;
 801
 802                 if (req->data->flags & MMC_DATA_STREAM) {
 803                         cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
 804                 }
 805         }
 806
 807         imxmci_start_cmd(host, req->cmd, cmdat);
 808 }
 809
 810 #define CLK_RATE 19200000
 811
 812 static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 813 {
 814         struct imxmci_host *host = mmc_priv(mmc);
 815         int prescaler;
 816
 817         if( ios->bus_width==MMC_BUS_WIDTH_4 ) {
 818                 host->actual_bus_width = MMC_BUS_WIDTH_4;
 819                 imx_gpio_mode(PB11_PF_SD_DAT3);
 820         }else{
 821                 host->actual_bus_width = MMC_BUS_WIDTH_1;
 822                 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
 823         }
 824
 825         if ( host->power_mode != ios->power_mode ) {
 826                 switch (ios->power_mode) {
 827                 case MMC_POWER_OFF:
 828                         break;
 829                 case MMC_POWER_UP:
 830                         set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
 831                         break;
 832                 case MMC_POWER_ON:
 833                         break;
 834                 }
 835                 host->power_mode = ios->power_mode;
 836         }
 837
 838         if ( ios->clock ) {
 839                 unsigned int clk;
 840
 841                 /* The prescaler is 5 for PERCLK2 equal to 96MHz
 842                  * then 96MHz / 5 = 19.2 MHz
 843                  */
 844                 clk=imx_get_perclk2();
 845                 prescaler=(clk+(CLK_RATE*7)/8)/CLK_RATE;
 846                 switch(prescaler) {
 847                 case 0:
 848                 case 1: prescaler = 0;
 849                         break;
 850                 case 2: prescaler = 1;
 851                         break;
 852                 case 3: prescaler = 2;
 853                         break;
 854                 case 4: prescaler = 4;
 855                         break;
 856                 default:
 857                 case 5: prescaler = 5;
 858                         break;
 859                 }
 860
 861                 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
 862                         clk, prescaler);
 863
 864                 for(clk=0; clk<8; clk++) {
 865                         int x;
 866                         x = CLK_RATE / (1<<clk);
 867                         if( x <= ios->clock)
 868                                 break;
 869                 }
 870
 871                 MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */
 872
 873                 imxmci_stop_clock(host);
 874                 MMC_CLK_RATE = (prescaler<<3) | clk;
 875                 /*
 876                  * Under my understanding, clock should not be started there, because it would
 877                  * initiate SDHC sequencer and send last or random command into card
 878                  */
 879                 /*imxmci_start_clock(host);*/
 880
 881                 dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
 882         } else {
 883                 imxmci_stop_clock(host);
 884         }
 885 }
 886
 887 static const struct mmc_host_ops imxmci_ops = {
 888         .request        = imxmci_request,
 889         .set_ios        = imxmci_set_ios,
 890 };
 891
 892 static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
 893 {
 894         int i;
 895
 896         for (i = 0; i < dev->num_resources; i++)
 897                 if (dev->resource[i].flags == mask && nr-- == 0)
 898                         return &dev->resource[i];
 899         return NULL;
 900 }
 901
 902 static int platform_device_irq(struct platform_device *dev, int nr)
 903 {
 904         int i;
 905
 906         for (i = 0; i < dev->num_resources; i++)
 907                 if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
 908                         return dev->resource[i].start;
 909         return NO_IRQ;
 910 }
 911
 912 static void imxmci_check_status(unsigned long data)
 913 {
 914         struct imxmci_host *host = (struct imxmci_host *)data;
 915
 916         if( host->pdata->card_present() != host->present ) {
 917                 host->present ^= 1;
 918                 dev_info(mmc_dev(host->mmc), "card %s\n",
 919                       host->present ? "inserted" : "removed");
 920
 921                 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
 922                 tasklet_schedule(&host->tasklet);
 923         }
 924
 925         if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
 926            test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
 927                 atomic_inc(&host->stuck_timeout);
 928                 if(atomic_read(&host->stuck_timeout) > 4)
 929                         tasklet_schedule(&host->tasklet);
 930         } else {
 931                 atomic_set(&host->stuck_timeout, 0);
 932
 933         }
 934
 935         mod_timer(&host->timer, jiffies + (HZ>>1));
 936 }
 937
 938 static int imxmci_probe(struct platform_device *pdev)
 939 {
 940         struct mmc_host *mmc;
 941         struct imxmci_host *host = NULL;
 942         struct resource *r;
 943         int ret = 0, irq;
 944
 945         printk(KERN_INFO "i.MX mmc driver\n");
 946
 947         r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
 948         irq = platform_device_irq(pdev, 0);
 949         if (!r || irq == NO_IRQ)
 950                 return -ENXIO;
 951
 952         r = request_mem_region(r->start, 0x100, "IMXMCI");
 953         if (!r)
 954                 return -EBUSY;
 955
 956         mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
 957         if (!mmc) {
 958                 ret = -ENOMEM;
 959                 goto out;
 960         }
 961
 962         mmc->ops = &imxmci_ops;
 963         mmc->f_min = 150000;
 964         mmc->f_max = CLK_RATE/2;
 965         mmc->ocr_avail = MMC_VDD_32_33;
 966         mmc->caps = MMC_CAP_4_BIT_DATA;
 967
 968         /* MMC core transfer sizes tunable parameters */
 969         mmc->max_hw_segs = 64;
 970         mmc->max_phys_segs = 64;
 971         mmc->max_seg_size = 64*512;     /* default PAGE_CACHE_SIZE */
 972         mmc->max_req_size = 64*512;     /* default PAGE_CACHE_SIZE */
 973         mmc->max_blk_size = 2048;
 974         mmc->max_blk_count = 65535;
 975
 976         host = mmc_priv(mmc);
 977         host->mmc = mmc;
 978         host->dma_allocated = 0;
 979         host->pdata = pdev->dev.platform_data;
 980
 981         spin_lock_init(&host->lock);
 982         host->res = r;
 983         host->irq = irq;
 984
 985         imx_gpio_mode(PB8_PF_SD_DAT0);
 986         imx_gpio_mode(PB9_PF_SD_DAT1);
 987         imx_gpio_mode(PB10_PF_SD_DAT2);
 988         /* Configured as GPIO with pull-up to ensure right MCC card mode */
 989         /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
 990         imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
 991         /* imx_gpio_mode(PB11_PF_SD_DAT3); */
 992         imx_gpio_mode(PB12_PF_SD_CLK);
 993         imx_gpio_mode(PB13_PF_SD_CMD);
 994
 995         imxmci_softreset();
 996
 997         if ( MMC_REV_NO != 0x390 ) {
 998                 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
 999                         MMC_REV_NO);
1000                 goto out;
1001         }
1002
1003         MMC_READ_TO = 0x2db4; /* recommended in data sheet */
1004
1005         host->imask = IMXMCI_INT_MASK_DEFAULT;
1006         MMC_INT_MASK = host->imask;
1007
1008
1009         if(imx_dma_request_by_prio(&host->dma, DRIVER_NAME, DMA_PRIO_LOW)<0){
1010                 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
1011                 ret = -EBUSY;
1012                 goto out;
1013         }
1014         host->dma_allocated=1;
1015         imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
1016
1017         tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
1018         host->status_reg=0;
1019         host->pending_events=0;
1020
1021         ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
1022         if (ret)
1023                 goto out;
1024
1025         host->present = host->pdata->card_present();
1026         init_timer(&host->timer);
1027         host->timer.data = (unsigned long)host;
1028         host->timer.function = imxmci_check_status;
1029         add_timer(&host->timer);
1030         mod_timer(&host->timer, jiffies + (HZ>>1));
1031
1032         platform_set_drvdata(pdev, mmc);
1033
1034         mmc_add_host(mmc);
1035
1036         return 0;
1037
1038 out:
1039         if (host) {
1040                 if(host->dma_allocated){
1041                         imx_dma_free(host->dma);
1042                         host->dma_allocated=0;
1043                 }
1044         }
1045         if (mmc)
1046                 mmc_free_host(mmc);
1047         release_resource(r);
1048         return ret;
1049 }
1050
1051 static int imxmci_remove(struct platform_device *pdev)
1052 {
1053         struct mmc_host *mmc = platform_get_drvdata(pdev);
1054
1055         platform_set_drvdata(pdev, NULL);
1056
1057         if (mmc) {
1058                 struct imxmci_host *host = mmc_priv(mmc);
1059
1060                 tasklet_disable(&host->tasklet);
1061
1062                 del_timer_sync(&host->timer);
1063                 mmc_remove_host(mmc);
1064
1065                 free_irq(host->irq, host);
1066                 if(host->dma_allocated){
1067                         imx_dma_free(host->dma);
1068                         host->dma_allocated=0;
1069                 }
1070
1071                 tasklet_kill(&host->tasklet);
1072
1073                 release_resource(host->res);
1074
1075                 mmc_free_host(mmc);
1076         }
1077         return 0;
1078 }
1079
1080 #ifdef CONFIG_PM
1081 static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1082 {
1083         struct mmc_host *mmc = platform_get_drvdata(dev);
1084         int ret = 0;
1085
1086         if (mmc)
1087                 ret = mmc_suspend_host(mmc, state);
1088
1089         return ret;
1090 }
1091
1092 static int imxmci_resume(struct platform_device *dev)
1093 {
1094         struct mmc_host *mmc = platform_get_drvdata(dev);
1095         struct imxmci_host *host;
1096         int ret = 0;
1097
1098         if (mmc) {
1099                 host = mmc_priv(mmc);
1100                 if(host)
1101                         set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1102                 ret = mmc_resume_host(mmc);
1103         }
1104
1105         return ret;
1106 }
1107 #else
1108 #define imxmci_suspend  NULL
1109 #define imxmci_resume   NULL
1110 #endif /* CONFIG_PM */
1111
1112 static struct platform_driver imxmci_driver = {
1113         .probe          = imxmci_probe,
1114         .remove         = imxmci_remove,
1115         .suspend        = imxmci_suspend,
1116         .resume         = imxmci_resume,
1117         .driver         = {
1118                 .name           = DRIVER_NAME,
1119         }
1120 };
1121
1122 static int __init imxmci_init(void)
1123 {
1124         return platform_driver_register(&imxmci_driver);
1125 }
1126
1127 static void __exit imxmci_exit(void)
1128 {
1129         platform_driver_unregister(&imxmci_driver);
1130 }
1131
1132 module_init(imxmci_init);
1133 module_exit(imxmci_exit);
1134
1135 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1136 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1137 MODULE_LICENSE("GPL");